I inserted the code into another project of mine, and it worked there as well... so I'm sure that the code works without issue.
I'm using VB 2008 Express
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VB.NET - Array - Length Question
Hello,
Let's say that I want a length of size 2, and then I want to put some strings in it
Dim Ar(2) as string
Ar(0) = "A"
Ar(1) = "B"
Why is it that I'm able to play around with the 3rd slot (2nd index)?
Ar(2) = "C"
So, I just made an array of size 2, but I can put THREE things in it?
So, when I want an array with Two slots and ONLY two slots in it, how can I make this happen?
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Answers
Its pretty standard with VB.Net, seems that the value in the declaration is the upper index
http://www.startvbdotnet.c
From MSDN
"The index of each dimension is 0-based, which means it ranges from 0 through its upper bound. Therefore, the length of a given dimension is greater by 1 than the declared upper bound for that dimension."
Although it may look odd, it is consistent.
In VB.NET if you want an array of LENGTH 3, you would (because of the zero-based indexing) declare an UPPERBOUND of 2.
The confusion arises because you say you want an array of LENGTH 2, and yet you use an UPPERBOUND of 2. What you put in the array's declaration signature is the upper bound, not the length. Try this code
Dim a(2) As String
Debug.WriteLine(a.Length)
Debug.WriteLine(UBound(a))
So the thing to remember is simply that, in VB.NET, LENGTH and UPPERBOUND are different.
Roger
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by: jaime_olivaresPosted on 2008-05-31 at 11:27:11ID: 21684591
strange result, it should generate an array bound exception